描述：给定字符串 num（非负整数）和整数 k，移除 k 位数字，使剩余数字最小。以字符串形式返回（不含前导零）。
Uncertainty reigns
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An uncrewed Space Launch System (SLS) rocket carrying the Orion spacecraft launches on the Artemis I flight test, on Nov. 16, 2022, at the Kennedy Space Center, Florida.
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A bullet strikes the back of his head, and he falls to the ground.
for (int i = n - 1; i 0; i--) {。关于这个话题，heLLoword翻译官方下载提供了深入分析